1 /* 2 * Copyright (c) 1988 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)mathimpl.h 5.4 (Berkeley) 3/5/91 34 */ 35 36 #include <sys/cdefs.h> 37 #include <math.h> 38 39 #if defined(vax)||defined(tahoe) 40 41 /* Deal with different ways to concatenate in cpp */ 42 # ifdef __STDC__ 43 # define cat3(a,b,c) a ## b ## c 44 # else 45 # define cat3(a,b,c) a/**/b/**/c 46 # endif 47 48 /* Deal with vax/tahoe byte order issues */ 49 # ifdef vax 50 # define cat3t(a,b,c) cat3(a,b,c) 51 # else 52 # define cat3t(a,b,c) cat3(a,c,b) 53 # endif 54 55 # define vccast(name) (*(const double *)(cat3(name,,x))) 56 57 /* 58 * Define a constant to high precision on a Vax or Tahoe. 59 * 60 * Args are the name to define, the decimal floating point value, 61 * four 16-bit chunks of the float value in hex 62 * (because the vax and tahoe differ in float format!), the power 63 * of 2 of the hex-float exponent, and the hex-float mantissa. 64 * Most of these arguments are not used at compile time; they are 65 * used in a post-check to make sure the constants were compiled 66 * correctly. 67 * 68 * People who want to use the constant will have to do their own 69 * #define foo vccast(foo) 70 * since CPP cannot do this for them from inside another macro (sigh). 71 * We define "vccast" if this needs doing. 72 */ 73 # define vc(name, value, x1,x2,x3,x4, bexp, xval) \ 74 const static long cat3(name,,x)[] = {cat3t(0x,x1,x2), cat3t(0x,x3,x4)}; 75 76 # define ic(name, value, bexp, xval) ; 77 78 #else /* vax or tahoe */ 79 80 /* Hooray, we have an IEEE machine */ 81 # undef vccast 82 # define vc(name, value, x1,x2,x3,x4, bexp, xval) ; 83 84 # define ic(name, value, bexp, xval) \ 85 const static double name = value; 86 87 #endif /* defined(vax)||defined(tahoe) */ 88 89 90 /* 91 * Functions internal to the math package, yet not static. 92 */ 93 extern double exp__E(); 94 extern double log__L(); 95 96